Solution Annealing - Heat to 815-845°C, hold for ½ hour per 25mm of thickness, slow furnace cool to 600°C and then quickly air cool. Slow cooling from 540-400°C will cause embrittlement.
Sub-Critical anneal - Heat to 760-815°C and then air cool or water quench.
This grade is not hardenable by thermal treatment.
Note that 430 is likely to scale more heavily at elevated temperatures than 304, and the scale produced is more difficult to remove by pickling.
Short time elevated temperature tensile strength
| Temperature, oC | 300 | 400 | 550 | 650 | 750 |
| Strength, MPa | 450 | 430 | 220 | 120 | 50 |
1. Annealing
Annealed 430 is in the softest and most ductile condition, and may be used for cold-working operations. The annealing temperature range is 760oC followed by cooling in air. Soak at 1500 F, furnace cool (50 F/hour) to 1100 F, then air cool.
2. Stress relieving
Stress relief after welding is not usually required, although 200-300oC is the recommended stress relieving temperature range.
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